VR UMG Slider - Can't drag, handle only "jumps" on click

Development Programming & Scripting
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Hey everyone,

I’m struggling with an issue regarding a UMG slider in my VR project (UE 5.6) and I’m hoping someone here might have an idea.

To narrow it down i used the VR-Template and just added a slider to the widget. My problem is that I can’t grab and drag the slider’s handle. When I “click” on the slider using the VR controller’s trigger, the handle just jumps to the location of the click. The actual drag functionality never engages.

I tried already:

  1. Adjustments like setting the slider’s Step Size to 0.01 or massively increasing the Thumb Image size

  2. I attempted to force the behavior by overriding the “On Mouse Button Down” and “On Mouse Move” functions in the widget blueprint. The initial click was always registered (On Mouse Button Down worked and set the slider value correctly). However, On Mouse Move never seemed to trigger, even while holding the trigger down and moving the controller. The drag state is just not being maintained.

I’m running out of ideas here. It feels like the “held down” state of the virtual mouse button isn’t being correctly passed to or recognized by the UMG system.

Does anyone know what I might be overlooking? Thanks in advance for any help!